Python: Strange sort of list of numbers
Python Programming Puzzles: Exercise-97 with Solution
Write a Python program to find the following strange sort of list of numbers: the first element is the smallest, the second is the largest of the remaining, the third is the smallest of the remaining, the fourth is the smallest of the remaining, etc.
Input: [1, 3, 4, 5, 11] Output: [1, 11, 3, 5, 4] Input: [27, 3, 8, 5, 1, 31] Output: [1, 31, 3, 27, 5, 8] Input: [1, 2, 7, 3, 4, 5, 6] Output: [1, 7, 2, 6, 3, 5, 4]
Pictorial Presentation:
Sample Solution:
Python Code:
#License: https://bit.ly/3oLErEI
def test(nums):
if len(nums) < 2:
return nums
result = []
for i in range(len(nums)//2):
result.append(min(nums))
nums.remove(min(nums))
result.append(max(nums))
nums.remove(max(nums))
if len(nums) > 0:
result.append(nums[0])
if len(result) < 2*len(nums):
result.extend(nums[len(result) // 2 + 1:len(result) // 2 + 1 + len(nums) - len(result)])
return result
nums = [1, 3, 4, 5, 11]
print("Original list of numbers:")
print(nums)
print("Strange sort of list of said numbers:")
print(test(nums))
nums = [27, 3, 8, 5, 1, 31]
print("\nOriginal list of numbers:")
print(nums)
print("Strange sort of list of said numbers:")
print(test(nums))
nums = [1, 2, 7, 3, 4, 5, 6]
print("\nOriginal list of numbers:")
print(nums)
print("Strange sort of list of said numbers:")
print(test(nums))
Sample Output:
Original list of numbers: [1, 3, 4, 5, 11] Strange sort of list of said numbers: [1, 11, 3, 5, 4] Original list of numbers: [27, 3, 8, 5, 1, 31] Strange sort of list of said numbers: [1, 31, 3, 27, 5, 8] Original list of numbers: [1, 2, 7, 3, 4, 5, 6] Strange sort of list of said numbers: [1, 7, 2, 6, 3, 5, 4]
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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